Principal Software Engineer - Office Suite Shared Experiences (OSSE)

Microsoft is a company where passionate innovators come together to collaborate, envision what can be, and build what’s next. Within the Office Suite Shared Experiences (OSSE) organization, we build largescale data platforms, experimentation systems, and shared service infrastructure that power critical Office and Copilot experiences used by hundreds of millions of users every day. 

We are seeking a Principal Software Engineer to provide technical leadership and architectural direction for our experimentation and insights platform. This role is responsible for designing, evolving, and scaling experimentation infrastructure and data systems that enable rapid, trustworthy decision making across Office and Copilot and requires specialized skills and experience for both architecting and designing experimentation systems, working with large data systems, and driving cross-organization initiatives.   

This is a senior technical leadership role with broad organizational impact. You will partner closely with engineering, product management, data science, applied science, and leadership teams to define long term architecture, influence cross organizational investments, and raise the technical bar for experimentation, reliability, and data driven engineering across Microsoft. 

Microsoft’s mission is to empower every person and every organization on the planet to achieve more. As employees, we come together with a growth mindset, innovate to empower others, and collaborate to realize our shared goals. Each day we build on our values of respect, integrity, and accountability to create a culture of inclusion where everyone can thrive at work and beyond. 

As a Principal Software Engineer, you will: 

Technical Leadership & Architecture 

• Provide end-to-end architectural leadership for largescale experimentation and experimentation infrastructure used across Office and Copilot.
• Define and evolve long term technical strategy for experimentation platforms, data pipelines, and shared services, balancing innovation, reliability, cost, and developer productivity.
• Act as a technical authority and advisor across multiple teams, guiding system design decisions and resolving complex, ambiguous technical challenges. 

Experimentation & Data Platforms 

• Lead the design and scaling of experimentation systems, including assignment, metrics, analysis, and insight generation.
• Drive best practices for trustworthy experimentation, including data quality, metric definitions, statistical rigor, and observability.
• Design and operate largescale data systems leveraging ECS, Kusto, Cosmos DB, and SCOPE to support both real time and batch analytics. 

Build, Operate & Evolve Shared Services 

• Build and evolve high reliability, multitenant services that are foundational to experimentation, insights, and decision making.
• Ensure systems meet Microsoft level expectations for availability, performance, security, and operational excellence.
• Serve as a Designated Responsible Individual (DRI) when needed, setting standards for incident response, post incident learning, and operational maturity. 

Cross Organizational Impact 

• Partner across Office, Copilot, and adjacent organizations to align experimentation strategy and infrastructure, reducing fragmentation and duplicative investments.
• Influence and drive cross organizational technical change, aligning teams around shared architecture, tooling, and standards.
• Mentor senior engineers and raise the overall technical bar through design reviews, technical deep dives, and coaching. 

AI, Insights & Innovation 

• Shape how AI/LLM driven insights are integrated into experimentation workflows to accelerate learning and improve engineering efficiency.
• Partner with PM, Applied Science, and Data Science teams to translate ambiguous business problems into scalable technical solutions. 

Culture & Values 

• Model Microsoft’s culture and values, including inclusion, accountability, and a growth mindset.
• Lead through influence, technical credibility, and collaboration rather than direct authority. 

Embody our